A hawk dives on a mouse. A lion chases a zebra. A spider wraps a fly in silk. Predation is the relationship where one organism kills and eats another. The predator benefits. The prey dies. It sounds simple, but predation shapes ecosystems in profound ways. Predators regulate prey populations. They remove the sick and weak, which can strengthen the prey population over time. They also change prey behavior. Elk graze less in open areas when wolves are around. That shift can allow vegetation to recover along streams.

Predators come in many forms. Carnivores like wolves and lions are the most familiar. But seed-eaters like mice are also predators, preying on seeds. Insect-eating birds prey on caterpillars. Parasitoids, like some wasps, lay eggs inside hosts that eventually die. Even herbivores can be predators of plants. The category depends on the interaction, not the species. A bear is a predator when it hunts salmon and a herbivore when it eats berries.

Types of predation

• Carnivory: eating animals.
• Herbivory: eating plants.
• Parasitoidism: larvae kill the host.
• Seed predation: eating seeds before dispersal.

Predation is not cruel. It is an ecological process, and it keeps populations in balance. Remove predators and prey populations can explode, then crash from disease or starvation.